Master Planning and Modeling

West Yost worked with the District to provide master planning for both its water and recycled water systems, and to provide the design for water and recycled water facilities. During this project, the West Yost team used a collaborative approach to create a plan that maximizes the benefit of recycled water as a long-term resource.

The South East Bay Plain (SEBP) basin study was conducted to support development of EBMUD’s Groundwater Management Plan (GMP) as part of EBMUD’s efforts to implement conjunctive use to improve water supply reliability. The project study area includes the City of Hayward.

The Woodland-Davis Clean Water Agency is a Joint Powers Authority representing the water supply interests of the cities of Davis and Woodland. Under the Aquifer Storage and Recover (ASR) Program, the City of Woodland is implementing a comprehensive ASR Program to help address its water supply needs during periods of peak demand and/or drought. The City of Davis may also choose to undertake its own ASR Program.

For the last 13 years, West Yost team members have served as the City’s water resources consultant, working closely with City staff to provide technical support on water supply and groundwater projects/programs. This support has ranged from groundwater basin management planning and technical studies, through groundwater modeling, well siting, wellfield management, well rehabilitation, wellhead treatment, development of groundwater GIS support tools and Aquifer Storage and Recovery.

West Yost prepared a Water Supply Master Plan using an integrated approach for water supply planning that addresses demand management, supply management, and infrastructure master planning. This project involves ongoing coordination with the City’s advisory committee to hear and comment on the plan at each stage of development, from analysis of demands and projections regarding future conservation to development of modeling scenarios and recommendations.

Over the past decade, West Yost has completed the water system Hydraulic Model Update Project and numerous comprehensive water supply planning studies for the City, including the South Modesto Interim Water Supply Study, the 2005 and 2010 Urban Water Management Plans, water system capacity studies, as well as preliminary design/design of critical distribution system improvement projects. The primary focus of these projects was the improved integration of existing groundwater and new treated surface water supply systems.

West Yost has developed Water Supply and Facilities Master Plans for eight California Water (Cal Water) Districts. These planning efforts have included groundwater quality and basin supply assessments, surface water supply alternatives, recycled water supplies, and extended period simulation models.

West Yost developed a new unidirectional flushing program for the City to assist in reducing customer complaints, improving water quality, and extending the longevity of their water system infrastructure. The project included developing an optimized flushing program using the City’s hydraulic model, creating a flushing sector map and flushing loops for the distribution system, developing field crew mapbooks, conducting and evaluating results of a pilot test on select areas, and developing a system-wide flushing program.

West Yost provided hydraulic modeling, analysis, and model development of recommended backbone potable water, wastewater, and recycled water infrastructure required to serve buildout of the proposed Southeast Growth Area (SEGA) Project located in Fresno, California.

West Yost is preparing a Water Focus Study for the City which will create a “roadmap” for future water system infrastructure, verify previous infrastructure sizing, ensure that the City is not missing any possible opportunities to build operational flexibility into planned facilities, and, most importantly, to seamlessly integrate a new treated surface water supply into the City.

West Yost has assisted the City in planning its water system for over 20 years, including development of their original Water Master Plan, creating and updating the City’s water system model, and developing an integrated water supply plan. West Yost is currently assisting the City in preparing a Citywide Water System Master Plan which will encompass the City’s potable water and recycled water systems.

West Yost provided the City with validation of its recycled water system hydraulic model, which originally was developed by City staff using H2OMAP®. West Yost also provided an extended period model that represents the current operational condition of the recycled water system. West Yost utilized the hydraulic model to evaluate scenarios to optimize the use of recycled water and provided flexibility in the operation of the system for future demands. The resulting work allows operational decisions to be made to reduce wastewater discharges.

West Yost conducted an initial hydraulic analysis of the potential to blend the elevated uranium concentrations in one well with water from other wells to produce an acceptable blended uranium concentration (less than or equal to 80 percent of 30 mg/L MCL). Utilizing the City’s water system hydraulic model, West Yost estimated the extent of possible dilution and coordinated with City staff to develop a proposed well operation plan and valving arrangement to force water from other wells to the Smyrna Well vicinity.

West Yost performed a cursory evaluation for the potential feasibility of developing a raw water system for the SJWD retail service area. This analysis evaluated agricultural vs. metered rates, including consideration for a “status quo” scenario, agricultural reuse, and a municipal reuse system.

West Yost worked with the Dublin San Ramon Services District (DSRSD) in master planning both its water and recycled water systems, and in the design of water and recycled water facilities. This work included the completion of a comprehensive Water Master Plan update integrating aggressive water conservation and reclaimed water elements. Through water conservation and the identification of reclaimed water use opportunities, the projected future potable water demands were significantly reduced, and therefore infrastructure sizing was also reduced, saving money.

West Yost is preparing a Water Supply Facilities Master Plan for Cal Water’s Visalia Service District. The project includes creating a hydraulic model using InfoWater® software. Cal Water has an existing geodatabase developed for the Visalia District facilities and desires to maintain a connection between the developed GIS and the hydraulic model.

West Yost developed a water distribution system master plan for the City, a fast-growing community in Southern Oregon with a current population of 21,000. The Grants Pass water distribution system consists of an 18 mgd water treatment plant, nine booster pumping stations, and eight reservoirs, and serves customers in seven separate pressure zones. West Yost refined and expanded an existing hydraulic model of the water distribution system by working closely with the City’s GIS staff and developing routines to export the data, which were required for the hydraulic model.

West Yost developed a dynamic hydraulic model for the City’s water distribution system. The new model incorporates GIS, geocodes customer billing data to allocate water demand, and was calibrated using an innovative and highly effective tracer analysis.